Booster displacement?

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a878bob

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I'm trying to compare apples to apples, the haskle literature measures output in cu/in, like 6.2 for a 15/30.

Other manufactures list displacement measured in volume by the diameter of the the piston and stroke length. So I just solved for the volume of the cylinder.

In seemingly similar models to the 15/30 the competitors displacement comes out 2.4 liters per stroke.

These two don't match up when converting to similar units. 2.4 liters = 146 cu/in

Anybody have an idea how to compare more directly for displacement ? Do you have to figure in the the pressure and subsequent volume change?

It might be easier to compare directly if anyone has the piston diameter and stroke of a 15/30.
 

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